托业阅读材料:反射星云
以下是留学群(www.liuxuequn.com)英语频道为大家整理的托业阅读材料-反射星云,希望对大家的托业考试有所帮助! 真眼看世界:反射星云 Reflection Nebula Just weeks after NASA astronauts repaired the Hubble Space Telescope in December 1999, the Hubble Heritage Project snapped this picture of NGC 1999, a reflection nebula in the constellation Orion. Like fog around a street lamp, a reflection nebula shines only because the light from an embedded source illuminates its dust; the nebula does not emit any visible light of its own. The nebula is famous in astronomical history because the first Herbig-Haro... [ 查看全文 ]托业阅读材料:反射星云的相关文章
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